chrome://flags
Extensions ToolBar Menu → Disabled
works now, but does not mean it will forever (depends on Google's choice and/or Centbrowser developers if too hard to keep this flag alive)
ps : BTW, aren't you a little bit overreacting
? You can pin all your extensions if you really want to 
(I know everybody has its own point of view, and I don't want to try to alter yours or convince you're wrong, but we are talking about a 16x16 icon in the corner of the browser...not really a big deal)
Extensions ToolBar Menu → Disabled
works now, but does not mean it will forever (depends on Google's choice and/or Centbrowser developers if too hard to keep this flag alive)
ps : BTW, aren't you a little bit overreacting
? You can pin all your extensions if you really want to (I know everybody has its own point of view, and I don't want to try to alter yours or convince you're wrong, but we are talking about a 16x16 icon in the corner of the browser...not really a big deal)